0397f495c0
Summary: In D58580 i have noted that `llvm::to_string()` is a memory hog. It uses `raw_string_ostream`, and since it was buffered, every `raw_string_ostream` had a cost of `BUFSIZ` bytes (which is `8192` at least here). So every `llvm::to_string()` call, even to just print an `int`, costed `8192` bytes. In D58580, getting rid of that buffering //had// significant performance and memory consumption improvements for `llvm-xray convert`. Similarly, in D58580 @rnk pointed out that the `raw_svector_ostream` is already unbuffered, and `write_unsigned_impl` and friends do internal buffering. So it should be ok performance-wise to just make the `raw_string_ostream` itself unbuffered. Here, i don't have any perf measurements. Another letdown is that i'm leaving a loose-end - not deleting the `flush()` method. I don't expect that cleanup to be anything more than just fixing every new compiler error, but i'm presently unable to do that. Will look into that later. Reviewers: rnk, zturner Reviewed By: rnk Subscribers: kristina, jdoerfert, llvm-commits, rnk Tags: #llvm Differential Revision: https://reviews.llvm.org/D58643 llvm-svn: 354819
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